WO2018024066A1

WO2018024066A1 - Collaboration message transmission method and terminal

Info

Publication number: WO2018024066A1
Application number: PCT/CN2017/091647
Authority: WO
Inventors: 苏宏家; 庞继勇; 朱俊
Original assignee: 华为技术有限公司
Priority date: 2016-08-04
Filing date: 2017-07-04
Publication date: 2018-02-08
Also published as: CN107690129A

Abstract

Provided are a collaboration message transmission method, comprising: a first terminal sending an indication message to a second terminal, the indication message comprising indication information about a time-frequency resource, and the indication message being used to indicate for the second terminal to send, on the time-frequency resource, a cooperation message to a third terminal; and the first terminal, together with the second terminal, sending, on the time-frequency resource, the collaboration message to the third terminal. In this way, the first terminal and the second terminal send the same cooperation message to the same destination on the same time-frequency resource; therefore, the power gain can be obtained by the cooperation message, and the coverage area of the cooperation message can be expanded, so that a third terminal originally located at a remote location can receive the collaboration message.

Description

Collaborative message transmission method and terminal

Technical field

The embodiments of the present application relate to the field of communications, and in particular, to a method and terminal for cooperative message transmission.

Background technique

Device-to-Deceive (D2D) communication based on cellular network, also known as End-to-End communication or Proximity Service (ProSe), means that terminal data can be transited without going through the network. Transfer directly between terminals. In the D2D communication mode, terminal data is directly transmitted between terminals, which avoids terminal data transmission in the cellular communication through the network, thereby generating link gain. In addition, resources for different D2Ds can be multiplexed, and resources of D2D communication and cellular communication can be multiplexed, thereby generating resource multiplexing gain. The link gain and resource multiplexing gain can improve the efficiency of the wireless spectrum resources, thereby improving the overall network throughput. The standardization work of D2D communication in the 3GPP LTE system has been started from the Release-12 version and has been enhanced in the Release-13 version.

The link between two terminals performing D2D communication may be referred to as a D2D link or an end-to-end link or a side link (Sidelink, SL). The Air Interface between the two terminals can be called PC-5. Working scenarios of D2D communication may include: In-Coverage (IC) and Out-of-Coverage (OoC).

When D2D communication is performed between at least two terminals in an OoC scenario, any terminal may not be able to communicate with the outside world. At this time, how to contact at least two terminals with the outside world is an urgent problem to be solved.

Summary of the invention

The embodiment of the present invention provides a method and a terminal for cooperative message transmission, where multiple terminals can send a cooperation message to the same destination address on the same time-frequency resource, so that the cooperation message can obtain power gain and expand the cooperation message. Coverage.

In a first aspect, a method for collaborative message transmission is provided, including:

The first terminal sends an indication message to the second terminal, where the indication message includes indication information of a time-frequency resource, where the indication message is used to indicate that the second terminal sends a collaboration message to the third terminal on the time-frequency resource;

The first terminal, together with the second terminal, sends the cooperation message to the third terminal on the time-frequency resource.

In the embodiment of the present application, the first terminal sends the same information to the same destination on the same time-frequency resource together with the second terminal by using the indication of the first information sent by the first terminal, so that the second information can be obtained. The gain, that is to say, the coverage of the second information can be expanded in a phased manner, so that the third terminal, which is relatively far away, can receive the second information.

In conjunction with the first aspect, in some possible implementations of the first aspect, the collaboration message comprises a discovery message, a data message, or a synchronization message.

In conjunction with the first aspect, in some possible implementation manners of the first aspect, the first terminal may send the indication message to the second terminal on the first physical channel. Optionally, the first physical channel may be the first control channel, or the first physical channel may be the first shared channel. The first control channel may be a PSCCH, and the first shared channel may be a PSSCH.

Optionally, the indication message may be used to indicate that the second terminal is sent on the time-frequency resource on the second physical channel. Send a collaborative message.

Optionally, the second physical channel may be a second control channel, and the cooperation message is a discovery message. Optionally, the second physical channel may be a second shared channel, and the cooperation message is a data message. Optionally, the second physical channel may be a physical synchronization channel, and the cooperation message is a synchronization message. The second control channel may be a PSDCH, and the second shared channel may be a PSSCH. Wherein, the data message may include side link data (SL data), and the synchronization message may include a synchronization signal, such as SLSS. The synchronization message may be periodically sent on a fixed proprietary time-frequency resource.

With reference to the first aspect, in some possible implementation manners of the first aspect, the indication message further includes a flag, where the identifier is specifically used to indicate that the second terminal sends the third terminal to the third terminal on the time-frequency resource. Collaboration news.

With reference to the first aspect, in some possible implementation manners of the first aspect, the indication message includes a media access control MAC service data unit (SDU), and a first field of the MAC SDU is used to indicate that the second terminal is The third terminal sends the cooperation message.

Optionally, the indication message further includes a MAC header field, where the MAC header field includes a second field, where the second field is used to indicate whether the MAC SDU includes the first field.

It can be understood that the indication message is a MAC PDU, and the MAC PDU includes a MAC header field and a MAC SDU. The MAC SDU includes a first field, and the MAC header field includes a second field.

In conjunction with the first aspect, in some possible implementation manners of the first aspect, the cooperation message includes special information, where the special information is used to indicate that the third terminal forwards the collaboration message to another device.

In this way, the third terminal can forward the cooperation message according to the special information in the cooperation message, thereby ensuring that the first terminal and the second terminal are indirectly discovered by other devices. Other devices herein may include at least one of a network device and other terminals.

In conjunction with the first aspect, in some possible implementation manners of the first aspect, the indication message further includes address information of the third terminal.

In this way, the second terminal can conveniently obtain the address information of the destination of the cooperation message according to the indication message, and ensure that the cooperation message is smoothly transmitted to the same device.

In a second aspect, a method for collaborative message transmission is provided, including:

The second terminal receives the indication message sent by the first terminal, where the indication message includes the indication information of the time-frequency resource, where the indication message is used to indicate that the second terminal sends the collaboration message to the third terminal on the time-frequency resource. ;

The second terminal sends the cooperation message to the third terminal on the time-frequency resource according to the indication message.

In the embodiment of the present application, the second terminal sends the same information to the same destination on the same time-frequency resource together with the first terminal according to the indication of the first information sent by the first terminal, so that the second information can be obtained. The gain, that is to say, the coverage of the second information can be expanded in a phased manner, so that the third terminal, which is relatively far away, can receive the second information.

In conjunction with the second aspect, in some possible implementations of the second aspect, the collaboration message comprises a discovery message, a data message, or a synchronization message.

With reference to the second aspect, in some possible implementation manners of the second aspect, the indication message includes a media access control MAC service data unit (SDU), and a first field of the MAC SDU is used to indicate that the second terminal is The third terminal sends the cooperation message.

Optionally, the indication message further includes a MAC header field, where the MAC header field includes a second field, and the second A field is used to indicate whether the MAC SDU includes the first field.

With reference to the second aspect, in some possible implementation manners of the second aspect, the cooperation message includes special information, where the special information is used to indicate that the third terminal forwards the collaboration message to another device.

In conjunction with the second aspect, in some possible implementation manners of the second aspect, the indication message further includes address information of the third terminal.

In a third aspect, a terminal is provided, including: a first sending unit and a second sending unit, the terminal being capable of implementing the method for cooperative message transmission described in the foregoing first aspect and various implementation manners thereof.

In a fourth aspect, a terminal is provided, including: a processor, a transceiver, and a memory. The memory is for storing code, the processor is configured to execute code in the memory, and when the code is executed, the processor may implement the cooperative information described in the foregoing first aspect and various implementation manners by using a transceiver The method of transmission.

In a fifth aspect, a computer readable storage medium is provided, the computer readable storage medium storing a program causing a terminal to perform any of the above first aspect and various implementations thereof for a cooperative message The method of transmission.

DRAWINGS

Figure 1 is a schematic diagram of a D2D transmission scenario.

FIG. 2 is a schematic diagram of a scenario for cooperative message transmission according to an embodiment of the present application.

FIG. 3 is a schematic flowchart of a method for cooperative message transmission in an embodiment of the present application.

FIG. 4 is a schematic diagram of an indication message and a cooperation message according to an embodiment of the present application.

FIG. 5 is another schematic diagram of an indication message and a collaboration message according to an embodiment of the present application.

FIG. 6 is another schematic diagram of an indication message and a collaboration message according to an embodiment of the present application.

FIG. 7 is another schematic diagram of an indication message and a collaboration message according to an embodiment of the present application.

FIG. 8 is another schematic diagram of an indication message and a collaboration message according to an embodiment of the present application.

FIG. 9 is another schematic diagram of an indication message and a collaboration message according to an embodiment of the present application.

FIG. 10 is a schematic diagram of a MAC PDU carrying an indication message according to an embodiment of the present application.

FIG. 11 is another schematic flowchart of a method for cooperative message transmission according to an embodiment of the present application.

FIG. 12 is another schematic flowchart of a method for cooperative message transmission according to an embodiment of the present application.

FIG. 13 is a structural block diagram of a terminal according to an embodiment of the present application.

FIG. 14 is another structural block diagram of a terminal according to an embodiment of the present application.

FIG. 15 is another structural block diagram of a terminal according to an embodiment of the present application.

FIG. 16 is another structural block diagram of a terminal according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

It should be understood that, in this embodiment of the present application, a terminal may be referred to as a user equipment (User Equipment, UE), an access terminal, a terminal device, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, and a mobile device. , user terminal, wireless communication device, user agent or user device. The terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), and a wireless communication function. Handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, and Terminal devices in the future New Radio (NR) network.

D2D communication is a direct communication technology. Data interaction between terminals does not need to be forwarded through the base station. Terminals can interact directly or directly under the aid of the network.

In the D2D description of the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE), the resource for performing D2D information transmission and reception is defined as a D2D Resource Pool. The resource pool used to send information is called a sending resource pool, and the resource pool used to receive information is a receiving resource pool. The D2D resource pool is composed of a series of Resource Blocks (RBs) in the frequency domain, and is composed of a series of symbols (Symbols) in the time domain. In 3GPP LTE D2D, the definition of RBs and symbols of the SL may be the same as the uplink (UL) of cellular communication.

The working scenarios of D2D communication may include: IC and OoC. As shown in FIG. 1, terminal 20 and terminal 30 are within service area 60 of base station 10, and terminal 40 and terminal 50 are outside service area 60 of base station 10. The D2D communication between the terminal 20 and the terminal 30 belongs to the working scenario of the IC; the D2D communication between the terminal 40 and the terminal 50 belongs to the working scenario of the OoC.

In the OoC scenario, since there is no association to any network device (such as a base station, eNB), the resource pool cannot be allocated/configured by the network, and the terminal 40 and the terminal 50 must send and receive information according to their pre-configured resource pool.

In the OoC scenario, the terminal 40 searches for a Sidelink Synchronization Signal (SLSS) and a Master Information Block-Sidelink (MIB-SL) in a predefined Resource Pool. ). If the SLSS or MIB-SL is not received within a certain time, the terminal 40 will actively send the SLSS and/or MIB-SL in a predefined transmission resource pool and randomly select a value within a predefined range of values. Identify yourself as the SLSS identifier (Identity, ID). If the terminal 50 receives the SLSS and/or MIB-SL from the terminal 40 and obtains the corresponding synchronization signal and/or system information by correct decoding, the terminal 50 can communicate with the terminal 40 that transmits the SLSS and/or the MIB-SL. Synchronization is performed for the SyncRef terminal, and the terminal 50 can configure the same SLSS ID as the terminal 40 to identify itself. The terminal 50 may also transmit the SLSS and/or the MIB-SL in accordance with the contents of the synchronization signal and/or system information included in the terminal 40. In this way, other terminals can synchronize with the synchronized terminal (i.e., terminal 50) to indirectly synchronize with terminal 40.

D2D communication can be roughly divided into two stages of D2D discovery and D2D transmission. The D2D discovery means that the terminal sends a discovery announcement, and the other terminal obtains the information of the terminal that sends the discovery message by reading the discovery message. The discovery message may include identity information of the terminal that sent the discovery message, such as identity. D2D transmission refers to the terminal sending control information and data. The other terminal obtains information such as the transmission format of the subsequent data by reading the control information, thereby correctly receiving subsequent data.

Taking the terminal 40 and the terminal 50 in FIG. 1 as an example, in the OoC scenario, the terminal 40 sends a discovery message on a Physical Sidelink Discovery Channel (PSDCH) in a predefined transmission resource pool (Discovery announcement). ). Similarly, the terminal 50 also searches for a discovery message on the PSDCH in the predefined receiving resource pool. The terminal 50 that correctly receives the discovery message can discover the sender (ie, the terminal 40 that sent the discovery message), thereby completing the discovery process. In the D2D transmission of the OoC scenario, the terminal is not associated with any network device (such as a base station, an eNB), and thus it is impossible to obtain a configuration resource pool allocated by the network. The terminal must send and receive information according to its pre-configured resource pool to implement communication. For example, the terminal 40 sends Side Link Control Information (SCI) format 0 (Format 0) on a physical side link control channel (PSCCH) in a predefined transmission resource pool. Signaling. On the physical side A Media Access Control Protocol Data Unit (MAC PDU), that is, a data packet, is transmitted on a Physical Sidelink Shared Channel (PSSCH). The terminal 40 can implement communication with the terminal 50 by transmitting signaling or data to the terminal 50 using resources in the transmission resource pool of the prior theorem.

The SCI format 0 is used to schedule the PSSCH, that is, the terminal 50 needs to decode the PSSCH sent by the terminal 40 according to the information in the correctly received SCI format 0, thereby obtaining the information in the data packet. The information contained in SCI format 0 can be as shown in Table 1 below:

Table 1

For example, the terminal 11 and the two terminals 12 shown in FIG. 2 can perform synchronization with each other and perform D2D communication in accordance with the above method. When the three terminals are in the OoC state, no one can communicate with the outside world. For example, in a natural disaster rescue, the terminal 11 and the two terminals 12 are in an emergency rescue, and are in an OoC state for some reason (for example, a network port). Therefore, it is necessary to consider how to make the three terminals communicate with each other (connected to the network).

FIG. 3 is a schematic flowchart of a method for cooperative message transmission according to an embodiment of the present application. It should be noted that although the transmitting end of the cooperative message in FIG. 3 shows two terminals: the terminal 11 and the terminal 12, the number of terminals may actually be three or more, or it may be understood that the terminal 12 represents at least one Terminal, this application is not limited thereto. The method shown in Figure 3 includes:

S102. The terminal 11 sends an indication message to the terminal 12.

S104. The terminal 11 sends the cooperation message together with the terminal 12 on the same time-frequency resource.

Here, the terminal 11 may be referred to as a transmitting end of the indication message, the terminal 12 may be referred to as a receiving end of the indication message, and the number of receiving ends indicating the message may be one or more.

Specifically, in S102, the terminal 11 sends an indication message through the SL, where the indication message may include a time-frequency resource. The indication information is used to indicate that the receiving end (such as the terminal 12) sends the cooperation message on the time-frequency resource.

In this embodiment of the present application, the collaboration message may be a discovery message, a data message, or a synchronization message. The data message may be a message containing control information and/or data information sent on the PSSCH. The synchronization message may include a synchronization signal, such as SLSS.

In the embodiment of the present application, the terminal 11 sends an indication message to initiate coordinated transmission with the terminal 12, which may be referred to as a primary coordination party, or a primary cooperation terminal (Master Cooperation terminal, MC-terminal).

Optionally, in the embodiment of the present application, before S102, the terminal 11 and the terminal 12 may further perform D2D synchronization. The MC-terminal may be determined during the synchronization process of the D2D. Specifically, if the terminal 11 cannot detect the SLSS for a period of time, the terminal 11 selects to actively send the SLSS and the MIB-SL for other terminals to synchronize with itself, and then the terminal. 12 detects the synchronization signal of the terminal 11 and synchronizes with the terminal 11, and at this time, the terminal 11 can initiate EU cooperation as the MC-terminal. The selection of the MC-terminal can also be determined through the signaling interaction between the terminal 11 and the terminal 12. For example, the terminal 11 actively initiates D2D communication, and requests to become an MC-terminal. The terminal 11 is determined through the interaction between the terminal 11 and the terminal 12. For the MC-terminal.

As an implementation manner, in S102, the terminal 11 may send the indication message on the first physical channel. The first physical channel is a control channel. For example, the first physical channel is a physical side link control channel (PSCCH).

Optionally, the indication message may be a newly defined L1 layer control signaling, such as the SCI format in LTE, ie, SCI format 1. The content contained in the SCI format 1 can be as shown in Table 2 below:

Table 2

Specifically, the terminal 11 may transmit the SCI format 1 by selecting a time-frequency resource (ie, a transmission resource) for the PSCCH in a predefined transmission resource pool through an end-to-end interface (for example, PC-5 in LTE).

The “resource block allocation and frequency hopping resource allocation” and the “time resource mode” are indication information of time-frequency resources. That is, the indication message in the embodiment of the present application includes indication information of a time-frequency resource.

As shown in FIG. 4, in S102, the sending end of the indication message is the terminal 11, the receiving end of the indication message is the terminal 12, and the indication message is the SCI format 1 sent on the PSCCH. Correspondingly, FIG. 5 shows that in S104, the transmitting end of the cooperation message is the terminal 11 and the terminal 12, the receiving end of the cooperation message is the terminal 13, and the terminal 11 and the terminal 12 send the cooperation message on the same time-frequency resource. The indication message includes indication information of the time-frequency resource.

Referring to the SCI format 0 of Table 1 above, SCI format 1 adds a flag (Flag) based on SCI format 0. That is to say, the indication message in the embodiment of the present application may further include a flag. Optionally, the identifier is a first identifier, a second identifier, or a third identifier, where the first identifier is used to indicate that the terminal 12 sends a discovery message on the time-frequency resource, and the second identifier is used to indicate that the terminal 12 is in the location The data message is sent on the time-frequency resource; the third indicator is used to instruct the terminal 12 to send the synchronization message on the time-frequency resource. Or the first indication is used to indicate that the terminal 12 sends a discovery message on the physical side link discovery channel (PSDCH) on the time-frequency resource; the second indication is used to indicate that the terminal 12 is in the time On the frequency resource, the data message is sent on the physical side link shared channel (PSSCH); the third indicator is used to instruct the terminal 12 to send the synchronization on the time-frequency resource dedicated to transmitting the synchronization signal (SS). The message, for example, can send a synchronization message on a physical synchronization channel.

Optionally, the length of the indication in the embodiment of the present application may be 2 bits. For example, "01" indicates the first indication, "10" indicates the second indication, and "11" indicates the third indication. Or, for example, "00" represents the first indication, "01" represents the second indication, and "10" represents the third indication. Etc., this application does not limit this.

Optionally, the length of the indication in the embodiment of the present application may also be 1 bit. The first value and the second value of the bit are utilized to indicate the transmission of the discovery message and the transmission of the data message, respectively. For example, "0" indicates the first indication and "1" indicates the second indication. The first indication is used to indicate that the terminal 12 sends a discovery message on the time-frequency resource, and the second indication is used to instruct the terminal 12 to send a data message on the time-frequency resource.

As another understanding, the indication message is used to instruct the terminal 12 to send a cooperation message on the time-frequency resource. Or the indication message is used to indicate that the cooperation message is sent on the second physical channel, where the time-frequency resource occupied by the second physical channel is the time-frequency resource. Wherein, if the indication in the indication message is the first indication, the second physical channel is a discovery channel, such as a PSDCH, and the cooperation message is a discovery message. If the indication in the indication message is the second indication, the second physical channel is a shared channel, such as a PSSCH, and the cooperation message is a data message. If the indication in the indication message is the third indication, the second physical channel is a physical synchronization channel (ie, a time-frequency resource dedicated to transmitting the synchronization signal), and the cooperation message is a synchronization message.

The first indication may be format 1A (which may be considered as a subclass of SCI Format 1), the second indication may be format 1B (which may be considered as a subclass of SCI Format 1), and the third indication may be format 1C ( Can be considered a subclass of SCI Format 1). That is, the indication may be format 1A or format 1B or format 1C. Accordingly, SCI format 1 may be considered to include three sub-formats, namely SCI format 1A, SCI format 1B, and SCI format 1C.

Specifically, if the label in Table 2 is format 1A, it is sub-format SCI format 1A; if the label in Table 2 is format 1B, it is sub-format SCI format 1B; if the label in Table 2 is format 1C, then For subformat SCI format 1C.

The format 1A can be used to instruct the terminal 12 to send a discovery message. Format 1B can be used to instruct terminal 12 to send a data message. Format 1C can be used to instruct terminal 12 to send a synchronization message.

For the terminal 12, it can be determined according to the length of the received message whether the received SCI format 0 or SCI format 1. If it is determined to be SCI format 1, the sub-format can be further determined to be SCI format 1A or SCI format 1B or SCI format 1C according to the content of the flag, so that the terminal 12 can determine that the cooperation message to be sent is a discovery message or a data message or synchronization. Message.

Optionally, the terminal 12 can distinguish between the SCI format 0 and the SCI format 1 by referring to the method for distinguishing different Downlink Control Information (DCI) Format, and details are not described herein again.

For example, if the indication in the indication message in S102 is format 1B, the sub-format SCI format 1B of the indication message is indicated. Then in S104, the terminal 11 and the terminal 12 can transmit control information to the terminal 13 before transmitting the data message.

As shown in FIG. 6, FIG. 6 shows that in S102, the transmitting end of the indication message is the terminal 11, the receiving end of the indication message is the terminal 12, and the indication message is the SCI format 1B transmitted on the PSCCH. Correspondingly, FIG. 7 shows that in S104, the transmitting end of the cooperation message is the terminal 11 and the terminal 12, and the receiving end of the cooperation message is the terminal 13. The terminal 11 and the terminal 12 transmit control information to the terminal 13 on the same time-frequency resource, and then transmit the data message on another identical time-frequency resource. The content of the data message sent by the terminal 11 and the terminal 12 is the same or the same. For example, the data messages sent by the terminal 11 and the terminal 12 are both used to instruct the terminal 13 to forward the cooperation message to other devices.

Specifically, as shown in FIG. 7, the terminal 11 and the terminal 12 may be on the same time-frequency resource (for example, transmitting control information on the PSCCH), and the control information is SCI format 0. The indication information of the time-frequency resource for transmitting the control information is included in the indication message of S102. Further, the terminal 13 decodes the terminal 11 and the terminal 12 on the same other time-frequency resource (for example, data transmitted in the PSSCH) according to the information in the correctly received SCI format 0, and the data is side link data (Sidelink Data). , SL Data). The time-frequency resource (ie, the same other time-frequency resource) for transmitting data may be indicated by a control message (ie, SCI format 0).

As another implementation manner, in S102, the terminal 11 may carry the indication message through a data packet of the L2 layer, that is, through a special Media Access Control (MAC) Protocol Data Unit (PDU). The special feature of the MAC PDU here is that it does not carry traditional data information, but carries control information. Also, it does not need to carry a sub-header compared to a conventional PSSCH MAC PDU. That is, the content of the SCI format 1 shown in Table 2 above may be carried in a data message corresponding to the PSCCH.

Optionally, before S102, the method further includes: the terminal 11 transmitting control information on the control channel. The control channel here is PSCCH, and the control information is SCI format 0. Further, in S102, the terminal 11 transmits a MAC PDU on the shared channel.

That is, in S102, the terminal 11 can transmit the indication message on the first physical channel. The first physical channel is a shared channel, for example, a PSSCH. And the indication message is carried in the MAC PDU.

The terminal 11 may configure the control signaling SCI format 0 of the PSCCH in advance, and send the MAC PDU by using the time-frequency resource indicated by the SCI format 0. Correspondingly, the terminal 12 receives the SCI format 0, and decodes the data packet transmitted by the terminal 11, that is, the MAC PDU on the PSSCH, in the specified manner on the time-frequency resource indicated by the SCI format 0.

As shown in FIG. 8, FIG. 8 shows that in S102, the transmitting end is the terminal 11, and the receiving end is the terminal 12. The terminal 11 transmits a control message on the PSCCH, the control message is SCI format 0, and then the terminal 11 transmits a MAC PDU on the PSSCH. The indication information is carried in the MAC PDU. Correspondingly, FIG. 9 shows that in S104, the transmitting end of the cooperation message is the terminal 11 and the terminal 12, and the receiving end of the cooperation message is the terminal 13. And the terminal 11 and the terminal 12 are in phase A collaborative message is sent on the same time-frequency resource. It can be understood that, if the terminal 11 and the terminal 12 in FIG. 9 transmit data, reference may be made to the process shown in FIG. 7, and details are not described herein again.

The MAC PDU may include a MAC header field and a MAC Service Data Unit (SDU), as shown in FIG. 10. The indication message is a MAC PDU. Or the indication message is a MAC SDU, the MAC SDU is included in the MAC PDU, and the MAC PDU further includes a MAC header field. The MAC SDU includes a first field, and the MAC header field includes a second field. The second field is used to indicate that the MAC SDU includes a first field, where the first field is used to instruct the terminal 12 to send a collaboration message. Optionally, the first field may be a flag, and the second field may be a cooperation flag (CF), as described below.

The MAC header field in the embodiment of the present application may be a MAC sub-header domain dedicated to D2D communication, and the MAC sub-header field includes a “Cooperation Flag (CF)”. Optionally, when the value of the CF field is the first value, the MAC PDU in which the MAC sub-header field is located is a Cooperative MAC PDU. The corresponding MAC SDU is a Cooperative MAC SDU (Cooperation MAC SDU). The cooperative MAC SDU includes a Flag field. When the value of the CF field is the second value, the MAC SDU does not include the Flag field. In this embodiment of the present application, the cooperative MAC PDU refers to a MAC PDU including a cooperative MAC SDU, where the cooperative MAC SDU includes the format and content of the SCI format 1 described above.

In a possible implementation manner, the MAC header field in the embodiment of the present application includes a SL-SCH sub-header field, and no longer includes an R/E/E/L/LCID/L sub-header field. Specifically, in the existing LTE protocol, the MAC header field must include an R/E/E/L/LCID/L sub-header field corresponding to the MAC SDU in addition to the SL-SCH sub-header field. However, the CF field in the SL-SCH sub-header field in the embodiment of the present application may be used to indicate whether it is a cooperative MAC PDU (for example, CF=1 indicates that the MAC PDU is a cooperative MAC PDU). That is to say, the MAC PDU in the embodiment of the present application is not a conventional data packet, and the format of the MAC SDU is fixed (that is, the format of the SCI format 1), so there is no need to include the R/E/E/L/LCID. /L subheader field.

As shown in FIG. 10, the MAC header field includes a Version (V) field, a CF field, a Source Address (SRC) field, and a Destination Address (DST) field, and may further include one or more reservations (R). Fields, three R fields are shown in FIG. The V field is used to indicate the version of the MAC PDU format. The R field is reserved and the default setting can be 0. The SRC field is the layer 2 source identifier (Source Layer-2ID) used to identify the source. The DST field is a layer 2 target identifier (Destination Layer-2ID) used to identify the target.

As shown in FIG. 10, the MAC SDU includes a flag, a frequency hopping flag, a resource block assignment and a hopping resource allocation, and a time resource pattern. ), Modulation and Coding Scheme (MCS), Timing advance indication, and Group destination ID.

It can be understood that the CF field in the MAC header field can be used to indicate whether the MAC SDU includes a Flag field. For example, as an example, a value of 1 in the CF field indicates that the MAC SDU includes a Flag field; a value of 0 in the CF field indicates that the MAC SDU does not include a Flag field. Or, as another example, a value of 0 in the CF field indicates that the MAC SDU includes a Flag field; a value of 1 in the CF field indicates that the MAC SDU does not include a Flag field.

Correspondingly, for the terminal 12, it can be determined according to the CF field in the MAC header field whether the corresponding MAC SDU includes a Flag field.

Referring to Table 2 above, it can be seen that the content included in the MAC SDU is the same as that included in the aforementioned SCI format 1. Optionally, the indication field in the embodiment of the present application may include a first indication or a second indication or a third indication. Phase For the description of the indication, refer to the related description of the above embodiment. To avoid repetition, details are not described herein again.

Optionally, the reserved field (or part of the reserved field) in the MAC header field is used to indicate the type of the collaborative message (eg, indicating that the collaborative message is a discovery message). At this time, there is no need to mark the (Flag) field in the MAC SDU, and there is no need to separately define the CF field in the MAC header field.

In addition, optionally, the indication message may further include destination address information of the cooperation message, such as address information of the terminal 13. In this way, the terminal 12 can directly determine the destination address of the cooperation message to be sent according to the destination address information included in the indication message.

Further, in S104, specifically, the terminal 11 and the terminal 12 use the same MCS to transmit the same cooperation message to the same target address (such as the terminal 13) on the same time-frequency resource.

As an example, the same target address may be a broadcast address or a pre-set special address. For example, if neither the terminal 11 nor the terminal 12 knows whether or not there is at least one terminal 13, then in S104, the terminal 11 and the terminal 12 can use the broadcast address or a preset special address as the target address. Wherein, the preset special address may refer to an address dedicated to receiving the cooperation message, for example, may be preset in the standard. Accordingly, the terminal 13 can receive the cooperation message according to the broadcast address or a preset special address.

Optionally, when the cooperation message is sent, a cooperation destination ID may be set, where the cooperation target identifier is a broadcast address or a preset special address. Correspondingly, a cooperation source ID corresponding to the cooperation target identifier may also be set. In this way, it is possible to facilitate the transmission and reception of information between the transmitting end and the receiving end of the cooperative message.

As another example, if any one of the terminal 11 and the terminal 12 knows that at least one terminal 13 exists, the terminal 11 and the terminal 12 can use the address of the terminal 13 as the target address.

It is possible that the terminal 13 has caused the terminal 11 and/or the terminal 12 to know the address information of the terminal 13 by some means. For example, the terminal 13 can cause the terminal 11 and/or the terminal 12 to receive the cooperation message of the terminal 13 using the method of cooperative message transmission of the embodiment of the present application. If the terminal 11 already knows the existence of the terminal 13, then as an implementation, the indication message may include the address information of the terminal 13. If the indication message includes the address information of the terminal 13, the terminal 11 transmits the cooperation message to the terminal 13 together with the terminal 12 in S104. If the terminal 12 already knows the existence of the terminal 13, the terminal 11 can notify the terminal 11 of the address information of the terminal 13 in the previous D2D transmission of the terminal 11 and the terminal 12.

In this way, the cooperation message will get power gain, that is to say, the coverage of the cooperation message can be expanded, so that the terminal 13 which is relatively far away can receive the cooperation message.

Optionally, the cooperation message in the embodiment of the present application may include special information, where the special information is used to instruct the terminal 13 to forward the cooperation message to other devices.

For example, if the terminal 13 is within the network coverage, that is, the terminal 13 can communicate directly with the network device, the terminal 13 can forward the cooperation message to the network device (e.g., base station) of the cell in which it is located. For example, the terminal 13 can forward the cooperation message to other relay terminals or D2D terminals or the like that can communicate with the terminal 13.

In addition, it should be noted that although the above embodiment of the present application assumes that the terminal 11 and the terminal 12 are in an OoC scenario, the above method of the present application can also be applied to the scenario of the IC. That is, if the terminal 11 and the terminal 12 are within the network coverage, the power gain can also be achieved by the method of cooperative message transmission described above. For example, the terminal 11 in FIG. 3 can be replaced with the terminal 20, and the terminal 12 can be replaced with The terminal 30 and the like are not limited in this application.

FIG. 11 is another schematic flowchart of a method for cooperative message transmission according to an embodiment of the present application. Figure 11 The method is performed by the first terminal, where the first terminal may be the terminal 11 in the foregoing embodiment, and the method includes:

S201. The first terminal sends the first information to the second terminal, where the first information is used to instruct the second terminal to send the second information.

S202. The first terminal, together with the second terminal, sends the second information to the third terminal on the same time-frequency resource.

Optionally, the first information may be sent by the first terminal on the SL between the first terminal and the second terminal. The first information may be carried on a first physical channel, where the first physical channel may be a control channel or a shared channel. For example, the control channel is PSCCH and the shared channel is PSSCH.

Optionally, the second information may be a discovery message or a data message (eg, including SL data) or a synchronization message (eg, including SLSS). The second information may be carried on the second physical channel. For example, if the second information is a discovery message, the second physical channel is a control channel (such as PSDCH); if the second information is a data message (such as SL Data), the second physical channel is a shared channel (such as PSSCH); The information is a synchronization message (such as SLSS), and the second physical channel is a time-frequency resource channel (which can be understood as a physical synchronization channel) dedicated to transmitting a synchronization signal.

Optionally, the time-frequency resource in S202 may be pre-agreed, and may be indicated by the first terminal in the signaling or information before S201, which may be indicated by the first information in S201, and the application does not limited.

As an implementation manner, the first information is an indication message, and the second information is a collaboration message. And the indication message includes indication information of a time-frequency resource, where the indication message is used to indicate that the second terminal sends a collaboration message to the third terminal on the time-frequency resource. For the S201, reference may be made to S102 in the foregoing embodiment of FIG. 3, and S202 may be referred to the foregoing S104 in the embodiment of FIG. 3. To avoid repetition, details are not described herein again.

FIG. 12 is another schematic flowchart of a method for cooperative message transmission according to an embodiment of the present application. The method shown in FIG. 12 is performed by the second terminal, where the second terminal may be the terminal 12 in the foregoing embodiment, and the method includes:

S301. The second terminal receives the first information sent by the first terminal, where the first information is used to instruct the second terminal to send the second information.

S302. The second terminal sends the second information to the third terminal on the same time-frequency resource together with the first terminal according to the first information.

Optionally, the first information may be carried on a first physical channel, where the first physical channel may be a control channel or a shared channel. For example, the control channel is PSCCH and the shared channel is PSSCH.

Optionally, the second information may be a discovery message or a data message (eg, including SL data) or a synchronization message (eg, including SLSS). The second information may be carried on the second physical channel. For example, if the second information is a discovery message, the second physical channel is a control channel (such as PSDCH); if the second information is a data message, the second physical channel is a shared channel (such as PSSCH); if the second information is a synchronization message, The second physical channel is a time-frequency resource channel (which can be understood as a physical synchronization channel) dedicated to transmitting a synchronization signal.

Optionally, the time-frequency resource in S302 may be pre-agreed, and may be indicated by the first terminal in the signaling or information before S301, and may be indicated by the first information in S301. limited.

As an implementation manner, the first information is an indication message, and the second information is a collaboration message. And the indication message includes indication information of a time-frequency resource, where the indication message is used to indicate that the second terminal sends a collaboration message to the third terminal on the time-frequency resource. The S301 can be referred to the foregoing S102 in the embodiment of FIG. 3, and the S302 can be referred to the foregoing S104 in the embodiment of FIG. 3. To avoid repetition, details are not described herein again.

FIG. 13 is a structural block diagram of a terminal according to an embodiment of the present application. The terminal 100 shown in FIG. 13 includes a first transmitting unit 401 and a second transmitting unit 402.

The first sending unit 401 is configured to send, to the second terminal, first information, where the first information is used to instruct the second terminal to send the second information.

The second sending unit 402 is configured to send, by the second terminal, the second information to the third terminal on the same time-frequency resource.

Optionally, the first information may be an indication message, and the second information may be a collaboration message. Correspondingly, the first sending unit 401 is configured to send an indication message to the second terminal, where the indication message includes indication information of a time-frequency resource, where the indication message is used to indicate that the second terminal is on the time-frequency resource. The third terminal sends a cooperation message; the second sending unit 402 is configured to send the cooperation message to the third terminal on the time-frequency resource together with the second terminal.

Optionally, the first sending unit 402 is specifically configured to send, by using the SL between the terminal 100 and the second terminal, an indication message to the second terminal on the first physical channel.

As an example, the first physical channel is a control channel, such as a PSCCH.

As another example, the first physical channel is a shared channel, such as a PSSCH. The first sending unit 401 is further configured to send control information to the second terminal on the PSCCH, where the control information is used to indicate a time-frequency resource of the indication message, and the like.

Optionally, the second sending unit 402 is specifically configured to send the cooperation message to the third terminal by using the same time-frequency resource with the second terminal on the second physical channel.

As an example, the second physical channel is a control channel, such as PSDCH, and accordingly, the cooperation message is a discovery message.

As another example, the second physical channel is a shared channel, such as a PSSCH, and accordingly, the cooperation message is a data message.

As another example, the second physical channel is a time-frequency resource channel (which can be understood as a physical synchronization channel) dedicated to transmitting a synchronization signal, and accordingly, the cooperation message is a synchronization message.

It can be understood that the first sending unit 401 and the second sending unit 402 in FIG. 13 can be implemented by a transceiver. As shown in FIG. 14, the terminal 100 includes a processor 410, a transceiver 420, and a memory 430. The memory 430 is used to store instructions executed by the processor 410. The processor 410 is specifically configured to send an indication message to the second terminal by using the transceiver 420, and send the cooperation message to the third terminal on the same time-frequency resource together with the second terminal.

The various components in the terminal 100 are coupled together by a bus system 440, which in addition to the data bus includes a power bus, a control bus, and a status signal bus.

The terminal 100 shown in FIG. 13 or the terminal 100 shown in FIG. 14 can implement the various processes performed by the terminal 11 in the foregoing method embodiments of FIG. 3 to FIG. 12, and the details are not described herein again.

FIG. 15 is a structural block diagram of a terminal according to an embodiment of the present application. The terminal 200 shown in FIG. 15 includes a receiving unit 501 and a transmitting unit 502.

The receiving unit 501 is configured to receive first information sent by the first terminal, where the first information is used to indicate that the second terminal sends Send the second message.

The sending unit 502 is configured to send, according to the first information received by the receiving unit 501, the second information to the third terminal on the same time-frequency resource together with the first terminal.

Optionally, the first information may be an indication message, and the second information may be a collaboration message. Correspondingly, the receiving unit 501 is configured to receive an indication message sent by the first terminal, where the indication message includes indication information of a time-frequency resource, where the indication message is used to indicate that the second terminal is in the time-frequency resource The third terminal sends a cooperation message; the sending unit 502 is configured to send the cooperation message to the third terminal according to the indication message received by the receiving unit 501 on the time-frequency resource.

Optionally, the receiving unit 501 is specifically configured to receive, by using the SL between the terminal 200 and the first terminal, an indication message sent by the first terminal, on the first physical channel.

Optionally, the sending unit 502 is specifically configured to send the cooperation message to the third terminal by using the same time-frequency resource with the first terminal on the second physical channel.

It can be understood that the receiving unit 501 in FIG. 15 can be implemented by a receiver, and the transmitting unit 502 can be implemented by a transmitter. As shown in FIG. 16, the terminal 200 includes a processor 510, a receiver 520, a transmitter 503, and a memory 540. The memory 540 is used to store instructions executed by the processor 510. The processor 510 is specifically configured to receive the indication message sent by the first terminal by using the receiver 520, and send the cooperation message to the third terminal on the same time-frequency resource together with the first terminal by using the transmitter 520.

The various components in the terminal 200 are coupled together by a bus system 550, which in addition to the data bus includes a power bus, a control bus, and a status signal bus.

The terminal 200 shown in FIG. 15 or the terminal 200 shown in FIG. 16 can implement the various processes performed by the terminal 12 in the foregoing method embodiments of FIG. 3 to FIG. 12, and details are not described herein again to avoid repetition.

The term "and/or" in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product can include one or more computer instructions. When the computer program instructions are loaded and executed on a computer, The processes or functions described in accordance with embodiments of the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber (DSL), or wireless (eg, infrared, wireless, microwave, etc.). The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic disk), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

A method for cooperative message transmission, comprising:

The first terminal sends an indication message to the second terminal, where the indication message includes indication information of a time-frequency resource, where the indication message is used to indicate that the second terminal sends a collaboration message to the third terminal on the time-frequency resource;

The first terminal, together with the second terminal, sends the cooperation message to the third terminal on the time-frequency resource.
The method of claim 1 wherein the collaboration message comprises a discovery message, a data message, or a synchronization message.
The method according to claim 1 or 2, wherein the indication message comprises a medium access control MAC service data unit SDU, and a first field of the MAC SDU is used to indicate that the second terminal is to the first The three terminals send the cooperation message.
The method according to claim 3, wherein the indication message further comprises a MAC header field, the MAC header field includes a second field, and the second field is used to indicate whether the MAC SDU includes the first A field.
The method according to any one of claims 1 to 4, wherein the cooperation message comprises special information, the special information being used to instruct the third terminal to forward the cooperation message to other devices.
The method according to any one of claims 1 to 5, wherein the indication message further comprises address information of the third terminal.
A method for cooperative message transmission, comprising:

The second terminal receives the indication message sent by the first terminal, where the indication message includes the indication information of the time-frequency resource, where the indication message is used to indicate that the second terminal sends the collaboration message to the third terminal on the time-frequency resource. ;

The second terminal sends the cooperation message to the third terminal on the time-frequency resource according to the indication message.
The method of claim 7, wherein the collaboration message comprises a discovery message, a data message, or a synchronization message.
The method according to claim 7 or 8, wherein the indication message comprises a medium access control MAC service data unit SDU, and a first field of the MAC SDU is used to indicate that the second terminal is to the The three terminals send the cooperation message.
The method according to claim 9, wherein the indication message further comprises a MAC header field, the MAC header field includes a second field, and the second field is used to indicate whether the MAC SDU includes the first A field.
The method according to any one of claims 7 to 10, wherein the cooperation message comprises special information, the special information is used to instruct the third terminal to forward the cooperation message to other devices.
The method according to any one of claims 7 to 11, wherein the indication message further comprises address information of the third terminal.
A terminal, comprising:

a first sending unit, configured to send an indication message to the second terminal, where the indication message includes indication information of a time-frequency resource, where the indication message is used to indicate that the second terminal is to the third terminal on the time-frequency resource Send a collaboration message;

a second sending unit, configured to send, by the second terminal, the cooperation message to the third terminal on the time-frequency resource.
The terminal according to claim 13, wherein the cooperation message comprises a discovery message, a data message or a synchronization message.
The terminal according to claim 13 or 14, wherein the indication message comprises a medium access control MAC service data unit SDU, and a first field of the MAC SDU is used to indicate that the second terminal is to the The three terminals send the cooperation message.
The terminal according to claim 15, wherein the indication message further includes a MAC header field, the MAC header field includes a second field, and the second field is used to indicate whether the MAC SDU includes the first A field.
The terminal according to any one of claims 13 to 16, wherein the cooperation message includes special information, and the special information is used to instruct the third terminal to forward the cooperation message to other devices.
The terminal according to any one of claims 13 to 17, wherein the indication message further includes address information of the third terminal.
A terminal, comprising:

a receiving unit, configured to receive an indication message sent by the first terminal, where the indication message includes indication information of a time-frequency resource, where the indication message is used to indicate that the second terminal sends the third terminal to the third terminal Collaborative message

And a sending unit, configured to send, according to the indication message received by the receiving unit, the collaboration message to the third terminal on the time-frequency resource.
The terminal according to claim 19, wherein the cooperation message comprises a discovery message, a data message or a synchronization message.
The terminal according to claim 19 or 20, wherein the indication message comprises a medium access control MAC service data unit SDU, and a first field of the MAC SDU is used to indicate that the second terminal is to the The three terminals send the cooperation message.
The terminal according to claim 21, wherein the indication message further includes a MAC header field, the MAC header field includes a second field, and the second field is used to indicate whether the MAC SDU includes the first A field.
The terminal according to any one of claims 19 to 22, wherein the cooperation message includes special information, and the special information is used to instruct the third terminal to forward the cooperation message to other devices.
The terminal according to any one of claims 19 to 23, wherein the indication message further includes address information of the third terminal.